DE102005038838A1 - Press arrangement - Google Patents

Abstract

Pressing arrangement comprises support parts (2, 4) detachedly connected to each other via traction rods (3) which bend in the axial direction and are inserted axially into the support parts. Preferred Features: The traction rods have a thickened part on each end. The traction rods are formed as leaf springs. The thickened parts are arranged in recesses of the support parts. The thickened parts are supported on the bearing surfaces of the support parts.

Description

The The invention relates to a press arrangement for dewatering or smoothing a Paper, board, tissue or another fibrous web in one Machine for producing and / or finishing the same with at least one, from a press and a counter-roller formed press nip whose axes at least at a roll end are stored in separate support parts, wherein the press roll has a rotating roll shell, which has a Pressing element is pressed to the counter roll and the opposite Support parts of at least one roll end via one or more tension rods releasably to each other are connected.

These fasteners are for example from the EP 531491 known and take up skewing due to rolling deflections and thermal changes in length by elastic deformation.

the However, they are in the interests of sufficient resilience for the, from depending on the press force tensile forces Set limits.

Besides that is the for the fasteners available standing space, especially limited for small press rolls.

Also the assembly or disassembly is particularly due to the limited accessibility difficult. Added to this are constructive adaptations of adjacent elements the press arrangement.

The The object of the invention is therefore to simplify the assembly of the tension rods and as possible also the impairment reduce adjacent machine elements.

According to the invention was solved the task by that the tension rods in the axial direction of the rolls pliable and in the axial direction the rollers can be used in the support parts.

Because of the flexibility in the axial direction also allow the tension rods furthermore thermally induced changes in length the roll axes and misalignments due to roll deflection.

By the applicability of the tension rods From the front, however, the assembly or disassembly improves considerably. Neighboring parts such as gutters; Scrapers stay off the connection unaffected and must at a release The connection can not be expanded.

The Solve the Connection is particularly in the roll change and the change of Roll mantle and of ribbons the pressing arrangement necessary.

For the simple Fixation of the tension rods At the support parts, the tie rods should be thickened at both ends exhibit.

Besides that is it for the warranty sufficient flexibility, if the tie rods after Type of leaf spring are formed, wherein the flexibility in parallel to the press plane is many times higher than perpendicular to the press plane.

to Realization of a connection between the tie rods and the support parts should at least the thickenings rest in recesses of the support parts. Therefor own in particular axially extending T-shaped grooves in the support parts to absorb the thickening.

The Thickening itself can with advantage hammerhead-shaped be educated.

In order to the tension rods big enough personnel be able to record, The thickenings should each be on a support surface of the Support support parts.

there It is because of the stresses and in the interest of a sufficient flexibility of advantage, if the expansion of the support surface in the axial Direction much larger than the extension of the tension rod between the thickenings in axial Direction is.

The Width of the support surface in the axial direction should be at least 50, preferably at least 100% larger than be the axial extension of the tie rod between the thickenings.

Around the flexibility in the axial direction much stronger than perpendicular to form and also the recording of the high tensile forces to enable the tie rod should be between the thickenings across the press plane at least 3, preferably at least 4 and in particular at least 5 times wider than in the axial direction.

The installation and removal of the tension rods is carried out in the unloaded state. To produce the connection, a spreader element can be used, which expands the distance between the support parts to a predetermined extent by the tension rods and thus tensions and stabilizes the connection. However, the clamping can also take place via a load of the contact pressure element. By the pressing element presses the roll shell to the counter roll, the distance between the support parts is also increased.

following the invention is based on an embodiment be explained in more detail. In the accompanying Drawing shows:

1 : a schematic side view and

2 a partial longitudinal view of the pressing arrangement.

The press arrangement has a press nip for dewatering or smoothing a fibrous web, in particular a paper web in a paper machine, from an upper press roll 1 and a lower counter roll 5 is formed.

Here are the axes 7 . 8th the rollers 1 . 5 in separate support parts 2 . 4 stored. While the axle 8th the counter roll 5 co-rotated with this is the axis 7 the press roll 1 fixed.

Therefore, axis can 7 and storage as well as support part 2 the press roll 1 smaller than the counter roll 5 be executed.

However, it is also possible that the counter roll 5 is carried out deflection-controlled. In this case, the axis is 8th the counter roll 5 also stationary, while the roll shell is acted upon by a contact pressure element.

The press roll 1 has a rotating roll shell 10 that is on the axis 7 supporting, stationary contact pressure element 9 to the counter roll 5 is pressed.

While with dimensionally stable roll shells 10 the contact element 9 , as shown, has a convex pressing surface, this can with flexible roll shell 10 be concave to form an extended press nip.

Extended press column allow because of the longer Dwell time an intensive yet volume-saving treatment the fibrous web.

The support parts 2 . 4 are on the leader side on both sides of the press level 14 the rollers 1 . 5 extending tension rods 3 detachably connected to each other.

It is essential that the tension rods 3 are flexible in the axial direction. This allows compensation of roll deflections and thermal elongation changes.

The elimination of bending stresses allows the tension rods 3 to reduce their dimensions and / or increase their capacity with respect to tensile stresses.

The tension rods 3 be axially in the support parts 2 . 4 inserted. This is done with a relaxed contact pressure 9 ,

When loading the contact pressure element 9 for generating the pressing forces in the press nip it comes to tensioning the tension rods 3 ie the development of tensile stresses.

The connection is released by releasing the contact pressure element 9 , Subsequently, the tension rods 3 or parts of it are removed.

Between the support parts 2 . 4 there is still a spreading element 11 which the support parts 2 . 4 If necessary, press apart and so can tighten the connection and relax.

The result is assembly and disassembly of the tension rods 3 much easier.

The tension rods 3 have thickenings at both ends 12 in the form of hammerheads. These thickenings 12 can in the unloaded state in appropriate recesses 13 in the form of T-shaped grooves of the support parts to be joined 2 . 4 be pushed.

When loaded by the spreader 11 it comes to tensioning the connection. Because the thickenings 12 axially in the support parts 2 . 4 be pushed, during assembly or disassembly no other machine parts, such. Scraper 6 to be mined.

The scraper 6 Here is an example at the upper support part 2 attached.

In particular, the weight of the tension rods 3 to minimize, is on both sides of the press level 14 one pull rod each 3 used.

The thickenings 12 are supported on a bearing surface A of the recess 13 the support parts 2 . 4 from. In order to ensure a sufficient load capacity for the tensile forces, the bearing surface A is twice as wide as the tension rod 3 between the thickenings 12 in the axial direction.

In the interest of sufficient flexibility of the tension rod 3 between the thickenings 12 (in the axial direction) is the width C of the tension rod 3 across the press plane 14 four times larger than the width B in the axial direction.

Claims (8)

Press arrangement for dewatering or smoothing a paper, board, tissue or other fibrous web in a machine for producing and / or finishing the same with at least one of a press ( 1 ) and a counter-roller ( 5 ) formed press nip whose axes ( 7 . 8th ) at least at one end of the roll in separate support parts ( 2 . 4 ), wherein the press roll ( 1 ) a rotating roll shell ( 10 ), which via a pressing element ( 9 ) to the counter roll ( 5 ) and the opposite support parts ( 2 . 4 ) at least one roll end via one or more tension rods ( 3 ) are releasably connected to each other, characterized in that the tension rods ( 3 ) in the axial direction pliable and in the axial direction in the support parts ( 2 . 4 ) can be used. Press arrangement according to claim 1, characterized in that the tension rods ( 3 ) at both ends a thickening ( 12 ) exhibit. Press arrangement according to claim 1 or 2, characterized in that the tension rods ( 3 ) are formed in the manner of a leaf spring, wherein the flexibility parallel to the press plane ( 14 ) many times higher than perpendicular to the press plane ( 14 ). Press arrangement according to one of the preceding claims, characterized in that at least the thickenings ( 12 ) in recesses ( 13 ) of the support parts ( 2 . 4 ) rest. Press arrangement according to one of claims 2 to 4, characterized in that the thickenings ( 12 ) on a support surface (A) of the support parts (A) 2 . 4 ). Press arrangement according to claim 5, characterized in that the extent of the support surface (A) in the axial direction substantially larger than the extension of the tension rod ( 3 ) between the thickenings ( 12 ) in the axial direction. Press arrangement according to claim 6, characterized in that the width of the support surface (A) in the axial direction at least 50, preferably at least 100% greater than the axial extent of the tension rod ( 3 ) between the thickenings ( 12 ). Press arrangement according to one of the preceding claims, characterized in that the tension rod ( 3 ) between the thickenings ( 12 ) across the press plane ( 14 ) is at least 3, preferably at least 4 and in particular at least 5 times wider than in the axial direction.